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Auger Observatory Science Topics: Spectrum, Neutrino Limits, Clusters, Photon Limit

This article explores various science topics studied at the Pierre Auger Observatory, including the measurement of spectrum, neutrino limits, clusters, and the photon limit. It also discusses the hybrid measurements used for calibration and energy reconstruction. The article compares the Auger Observatory data with other experiments like HiRes1 and AGASA. Additionally, it mentions ongoing research on signal processing and the theoretical uncertainties involved.

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Auger Observatory Science Topics: Spectrum, Neutrino Limits, Clusters, Photon Limit

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  1. Pierre Auger Observatory Some science topics Spectrum Inclined Events Fluorescence Yield Neutrino Limits Clusters/Anisotropy (Diego Harari) Photon Limit (Markus Risse) James W. Cronin Rencontres du Vietnam Hanoi August 7, 2006 1

  2. S1000 is Energy parameter 8

  3. SD energy ~ 1019.8

  4. Key feature of the Auger Observatory Hybrid measurements: Calibration of energy and shower geometry by fluorescence telescope

  5. 14

  6. Measured , not simulated

  7. Measured Not simulated By Tokonatsu Yamamoto University of Chicago

  8. Normalized to 1.0 at sec theta = 1.27 or theta = 38 deg Attenuation curve by constant intensity technique Measured from data not simulated 16

  9. ICRC 2005 18

  10. 19

  11. Comparison with HiRes1, AGASA

  12. 32,000 Inclined showers ≥ 600 Very large events with more than 50 tanks triggered

  13. Energy reconstruction Log(E/EeV) = 0.73 ± 0.03 + (1.04 ± 0.06) log(N19) Hybrid data: FD versus SD reconstruction Inclined showers > 60 deg

  14. 9 Signal processing can extract em/muon ratio

  15. Old Shower: pure muons 11

  16. Work in progress Preliminary ! Theoretical uncertainty ± factor 3 Preliminary ! 23

  17. Elongation Rate 17.5 18.5 18.0 18.75 19.25 19.75 Nicholas Busca Nicholas Busca

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